| // Copyright 2016 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| //go:build !plan9 && !windows | |
| // +build !plan9,!windows | |
| // Test that a sequence of callbacks from C to Go get the same m. | |
| // This failed to be true on arm and arm64, which was the root cause | |
| // of issue 13881. | |
| package main | |
| /* | |
| #include <stddef.h> | |
| #include <pthread.h> | |
| extern void GoCheckM(); | |
| static void* thread(void* arg __attribute__ ((unused))) { | |
| GoCheckM(); | |
| return NULL; | |
| } | |
| static void CheckM() { | |
| pthread_t tid; | |
| pthread_create(&tid, NULL, thread, NULL); | |
| pthread_join(tid, NULL); | |
| pthread_create(&tid, NULL, thread, NULL); | |
| pthread_join(tid, NULL); | |
| } | |
| */ | |
| import "C" | |
| import ( | |
| "fmt" | |
| "os" | |
| ) | |
| func init() { | |
| register("EnsureDropM", EnsureDropM) | |
| } | |
| var savedM uintptr | |
| //export GoCheckM | |
| func GoCheckM() { | |
| m := runtime_getm_for_test() | |
| if savedM == 0 { | |
| savedM = m | |
| } else if savedM != m { | |
| fmt.Printf("m == %x want %x\n", m, savedM) | |
| os.Exit(1) | |
| } | |
| } | |
| func EnsureDropM() { | |
| C.CheckM() | |
| fmt.Println("OK") | |
| } | |